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In order to get the best mode, H.264 computes the cost of every mode for each block by RDO (rate distortion optimization) technique, but it increases a high computational complexity .This paper combines Pan's fast algorithm and an efficient fast mode decision for intra prediction is proposed. First, the intra prediction's types are decided by whether a block is smooth. Second, the Pan's fast algorithm...
In this paper, we propose a unified loop filter for high-performance video coding, which suppresses the quantization noise optimally and improves the objective and subjective quality of the reconstructed picture simultaneously. The proposed filter unifies nonlinear enhancement filter (for removing blocking and ringing artifacts) and linear restoration filter (for improving coding efficiency) within...
H.264/AVC outperforms the previous coding standards thanks to variable block size motion compensation (VBSMC) ranging from 4 × 4 to 16 × 16 in interframe coding. However, this new feature causes extremely high computation complexity when rate-distortion optimization(RDO) is performed using full mode decision. In this paper, we propose an adaptive fast block mode decision algorithm (AFBMD) leveraging...
An effective representation of 3D video in future 3D-TV systems consists of monoscopic video (colour component) and associated per-pixel depth information (depth component). As depth component indicates relative distance between objects within the scene and a camera, pixel values change not only when objects move in vertical and horizontal directions but also when they move in a depth direction. Instead...
In several telepresence applications the transmitting end is resource constrained, hence multi-view video has to be source coded and transmitted to a location where stereo matching is performed. The effect of video source coding on stereo matching techniques is presently not well understood. In this paper, we present an analysis which quantitatively demonstrates the impact of standard video coding...
To efficiently transmit H.264/AVC coded video over error prone channel, an end-to-end rate distortion optimized motion estimation is proposed. The end-to-end pixel level distortion of transmitted frame is estimated at the encoder, and then the distortion of reference frame area is weighted and combined with the conventional Lagrangian cost of motion estimation to form an enhanced cost function. By...
This paper presents a perceptual H.264/AVC video coding method based on a foveated just-noticeable-distortion (JND) model. Since the perceptual acuity decreases with the increased eccentricity, a foveation model is adopted to further explore the perceptual redundancy in addition to the spatial and temporal just-noticeable-distortion models. Bit allocation and rate-distortion optimization algorithms...
H.264/AVC video coding standard uses the rate distortion optimization method which determines the best coding mode for macroblock (MB) to improve coding efficiency. Whereas RDO selects the best coding mode, it causes the heavy computational burden comparing with previous standards. In this paper, a fast intra prediction mode decision algorithm using two-path structure is proposed. In the first path,...
Multiview video coding is an emerging application where, in addition to classical temporal prediction, an efficient disparity prediction should be performed in order to achieve the best compression performance. A popular coder is the multiview video coding (MVC) extension of H.264/AVC, which uses a block-based disparity estimation (just like temporal prediction in H.264/AVC). In this paper, we propose...
The US military will use digital video compression for many different operations and applications. System requirements result in the need to transmit video streams within limited bandwidth, and often over harsh transmission environments. To deliver video with sufficient quality, the most modern video encoders and decoders (codecs) need to be employed with parameters optimized for high compression...
In order to achieve the high compression efficiency, H.264/AVC adopts rate-distortion optimization ( RDO ) technology with full mode search in intra prediction. The computational complexity is so high that it isn't fit for real time encoding and hardware design. So we proposed a fast and efficient intra prediction algorithm. We choose intra luma 4times4 or intra luma 16times16 based on smooth degree...
As the newest video coding standard, H.264/AVC uses the rate distortion optimization(RDO) method to select the optimal coding mode after the calculation of all the possible modes. The computational complexity is increased drastically, so it isn't fit for real time encoding and hardware design. In this paper, we propose a fast intra mode decision algorithm based on texture feature for H.264/AVC. First...
The proposed method has been developed according to the requirements of surveillance application scenarios, aiming at achieving bit-rate optimisation and adaptation of surveillance videos for storing and transmission purposes. For every frame between two successive intra refresh frames, the motion affected blocks are statistic analyzed and the error sensitive ones are selected as intra refreshed macroblocks...
In this paper, a fast mode decision algorithm for intra prediction in the H.264/AVC is proposed. We use the characteristics of each directional prediction mode to compute the strength of directional differences in the original pixel domain to find the minimal direction error. This is the first time reported in the literature that the intrinsic differences between the real-data and the predictors of...
Existing vertex-based shape coding algorithms use a number of different distortion measurement techniques including the shortest absolute distance (SAD), distortion band (DB) or tolerance band (TB), accurate distortion measurement technique for shape coding (ADMSC) and distortion measurement based on chord-length-parameterisation (DMCLP). Among these techniques DMCLP is computationally the fastest...
In this paper, a decoder side motion vector derivation scheme for inter frame video coding is proposed. Using a template matching algorithm, motion information is derived at the decoder instead of explicitly coding the information into the bitstream. Based on Lagrangian rate-distortion optimisation, the encoder locally signals whether motion derivation or forward motion coding is used. While our method...
Pattern-based video coding (PVC) has already established its superiority over recent video coding standard H.264, at low bit rate because of an extra pattern-mode to segment out the arbitrary shape of the moving region within the macroblock (MB). To determine the pattern-mode, the PVC however uses three thresholds to reduce the number of MBs coded using the pattern- mode. By setting these content-sensitive...
This paper describes our techniques to design the intra-prediction of AVS encoder for HDTV applications. The whole design is optimized in both the algorithm and architecture levels. On the algorithm level, since the Plane mode is the most area-costly one, it is temporarily ignored. And SATD is lastly chosen as mode decision to balance the hardware implementation with performance of Rate and Distortion...
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